Quick fix for code p0446 evap emissions vent circuit low.

As the title says: some might have an ses p0446, evap emissions vent circuit low. If you take it to the dealer they want 300-400.00 to fix the problem. GM has a service bulletin on this condition and have the updated part for 180.00, thats suppose to eliminate this issue.
Basically the problem is, the evap purge vent valve gets clogged with dirt, especially if the truck is used in dirty conditions. Well I figured there had to be a cheaper way to cure this problem.
Here it is:
1) find the location of the vent valve; its under the truck, locate the charcoal canister on the front of the gas tank and trace the vent line to the vent valve.
2) Take the bracket loose with a 5/8 wrench.
3) Spin the valve around so the side with the hole is facing you.
4) Take an air compressor and blow the vent valve out.
5) reinstall and clear the code and it's fixed.

Now I know the updated part from gm is supposed to keep the valve from clogging ever again, but why spend the money when all you have to do is blow out the vent valve every 50k-100kmi and save your $$$!

Now I know the updated part from gm is supposed to keep the valve from clogging ever again, but why spend the money when all you have to do is blow out the vent valve every 50k-100kmi and save your $$$!

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In a lot of ways, I like your attitude. Is routine maintenance (especially something as simple as this) so painful that we have to pay through the nose to avoid it?

I removed the vent valve on my 2000 Silverado located between the cab and box, blew it out and had quite a bit of dust come out. I then gave it a shot of WD-40. Put it back together and reset the ck engine light. Lasted about a day before it popped again, same code 0440 and 0449. Can this valve be taken apart to more throughly clean, It looks like it would come apart?

I removed the vent valve on my 2000 Silverado located between the cab and box, blew it out and had quite a bit of dust come out. I then gave it a shot of WD-40. Put it back together and reset the ck engine light. Lasted about a day before it popped again, same code 0440 and 0449. Can this valve be taken apart to more throughly clean, It looks like it would come apart?

Jeff

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This fix is for code p0446, not p0440 or p0449! You have a different problem!